<!DOCTYPE html>
<title>Declarative Shadow DOM innerHTML</title>
<link rel='author' title='Mason Freed' href='mailto:masonfreed@chromium.org'>
<link rel='help' href='https://github.com/whatwg/dom/issues/831'>
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>

<body>
<script>
function myObserver(mutationsList) {
  for (let mutation of mutationsList) {
    for (let n of mutation.addedNodes) {
      if (n.id === 'shadow') {
        n.innerHTML = "<span id=replaced>This should be in &lt;div>'s shadow root</span>";
      }
    }
  }
}
var observer = new MutationObserver(myObserver);
observer.observe(document.body, { childList: true, subtree: true });
</script>

<div id=host>
  <template id=shadow shadowroot=open>
    <span id=toreplace>This should get removed</span>
    <script></script> <!-- Ensure observer runs -->
  </template>
</div>

<script>
test(t => {
  t.add_cleanup(function() { observer.disconnect(); });
  let host = document.querySelector('#host');
  let template = host.querySelector('template');
  assert_true(!template, 'Declarative shadow template should not be left over');
  let shadowroot = host.shadowRoot;
  assert_true(!!shadowroot, 'Shadow root should be present');
  assert_true(!!shadowroot.querySelector('#replaced'),'The innerHTML replacement content should be present');
  assert_true(!shadowroot.querySelector('#toreplace'),'The old replaced content should not be present');
}, 'Declarative Shadow DOM: innerHTML should work while parsing declarative shadow root <template>');
</script>
</body>
